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yeah there is some difference in these two books...
the first on Proakis is a good book for understanding the theory & it explains the algorithm with good mathematical explaination. So its good to get conceptual understanding.
But, Mitra is more on explaining the theory with a matlab example. So people like the books which explain with an exaplme.
My advice is read both. so you get good theory from prakis & good practical from Mitra.